Help please ladies. My 2yr old DD is 95cm and weighs 15kg. She's just about out of her car seat with 5 point harness and we cannot find a booster seat with such a harness that'll fit her. She's too little for a 3 point & can't be trusted not to wriggle out of it. Short of paying £400 for a Britax special needs chair (which she isn't) does anyone know of a tall toddler seat that'd do please?